/Engine/Source/Runtime/Engine/Public/Physics/ImmediatePhysics/ImmediatePhysicsChaos/ImmediatePhysicsActorHandle_Chaos.h
Normally used to modify a EParticleType::Rigid between kinematic and dynamic. Returns true if that was possible (even if nothing changed). Returns false if it fails - e.g. because there was no current ParticleHandle, or if the particle type was not EParticleType::Rigid (unless the current type was EParticleType::Kinematic and bKinematic was true)
bool SetIsKinematic ( bool bKinematic )